jsr166 vs jdk-9+114

[Alan Bateman]

On 19/04/2016 21:45, Martin Buchholz wrote:
> I tried upgrading my local jdk to jdk-9+114 and jsr166 tests failed with:
>
>       [java] Executing '/home/martin/jdk/jdk9/bin/java' with arguments:
>       [java] '-Xpatch:/home/martin/jsr166/pristine/build/classes'
>       [java] '-XaddReads:java.base=jdk.unsupported'
>       [java] '-ea'
>       [java] '-esa'
>       [java] '-Djsr166.testImplementationDetails=true'
>       [java] '-Djsr166.tckTestClass=JSR166TestCase'
>       [java] '-classpath'
>       [java] '/home/martin/jsr166/pristine/lib/junit.jar:/home/martin/jsr166/pristine/build/tck-classes'
>       [java] 'JSR166TestCase'
>       [java]
>       [java] The ' characters around the executable and arguments are
>       [java] not part of the command.
>       [java] Error occurred during initialization of VM
>       [java] java.lang.NoClassDefFoundError: Could not initialize class
> java.lang.ThreadLocal
>       [java] at java.lang.StringCoding.<clinit>(java.base/StringCoding.java:62)
>       [java] at java.lang.String.<init>(java.base/String.java:587)
>       [java] at java.lang.String.<init>(java.base/String.java:609)
>       [java] at java.lang.System.initProperties(java.base/Native Method)
>       [java] at java.lang.System.initPhase1(java.base/System.java:1850)
>
> StringCoding.java:62 is just doing new ThreadLocal<>(); why would that fail?
> Why doesn't the error include more details on WHY it's failing?
> Surely ThreadLocal can be found!
> (this may be a long-standing diagnosability problem with the JDK)
> I don't see any obvious way to debug this, although I suspect our
> temporary use of '-XaddReads:java.base=jdk.unsupported'
The VM can only load an execute in java.base during early startup. In 
this case, it's really early in the initialization of java.lang.System. 
I assume the NoClassDefFoundError is when trying to load 
sun.misc.Unsafe, probably AtomicInteger because ThreadLocal uses it. I 
don't think this is solvable without moving the jsr166 classes to 
jdk.internal.misc.Unsafe.

-Alan